Goodwill and Other Intangible Assets - Goodwill (Details) $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 13,476.3
Additions	162.0
Other	(0.6)
Currency translation adjustments	(71.1)
Balance at end of period	13,566.6
Application Software
Goodwill [Roll Forward]
Balance at beginning of period	8,889.3
Additions	162.0
Other	0.1
Currency translation adjustments	(25.4)
Balance at end of period	9,026.0
Network Software
Goodwill [Roll Forward]
Balance at beginning of period	3,655.3
Additions	0.0
Other	(0.7)
Currency translation adjustments	(45.5)
Balance at end of period	3,609.1
Technology Enabled Products
Goodwill [Roll Forward]
Balance at beginning of period	931.7
Additions	0.0
Other	0.0
Currency translation adjustments	(0.2)
Balance at end of period	$ 931.5